| | Elk Rapids township, MI | Indian River, MI | United States |
| Population | 2,529 | 2,128 | 329,725,481 |
| Female Population | 55.1% | 46.9% | 50.5% |
| Male Population | 44.9% | 53.1% | 49.5% |
| Median Age | 56.4 | 56.3 | 38.4 |
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| Population - 2010 | 2,623 | 1,736 | 309,327,143 |
| Population - 2000 | 2,741 | 2,008 | 285,036,114 |
| Population - 1990 | 2,374 | 1,516 | 251,960,433 |
| Pop. 2000 to Now | -4.9% | -7.0% | 15.6% |
| Pop. 1990 to Now | 9.9% | 23.2% | 30.8% |
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| Population Density | 357.2 | 165.4 | 93.4 |
| Land Area | 7.1 | 12.9 | 3,531,905.4 |
| Water Area | 3.9 | 7.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Elk Rapids township, MI | Indian River, MI | United States |
| Age 0 to 4 | 2.8% | 3.4% | 5.9% |
| Age 5 to 9 | 4.3% | 0.6% | 6.1% |
| Age 10 to 14 | 6.5% | 3.4% | 6.6% |
| Age 15 to 17 | 1.7% | 4.2% | 3.9% |
| Age 18 to 20 | 1.9% | 5.5% | 4.0% |
| Age 21 to 24 | 3.8% | 0.9% | 5.2% |
| Age 25 to 34 | 7.7% | 8.6% | 13.8% |
| Age 35 to 44 | 7.4% | 8.6% | 12.9% |
| Age 45 to 54 | 10.9% | 12.4% | 12.6% |
| Age 55 to 59 | 9.3% | 6.5% | 6.7% |
| Age 60 to 64 | 9.6% | 10.9% | 6.3% |
| Age 65 to 74 | 19.3% | 18.7% | 9.6% |
| Age 75 to 84 | 10.9% | 10.1% | 4.5% |
| Age 85 and over | 3.9% | 6.0% | 1.9% |
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| Race | | | |
| | Elk Rapids township, MI | Indian River, MI | United States |
| White | 95.8% | 94.1% | 59.4% |
| Black | 0.1% | 0.0% | 12.2% |
| Asian | 0.8% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 4.6% | 3.2% |
| Hispanic | 2.1% | 1.3% | 18.4% |
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| Marriage & Family | | | |
| | Elk Rapids township, MI | Indian River, MI | United States |
| Married Population | 62.1% | 49.5% | 49.8% |
| Currently Married | 61.0% | 49.2% | 48.0% |
| Married but Separated | 1.1% | 0.3% | 1.8% |
| Single Population | 37.9% | 50.5% | 50.2% |
| Never Married | 16.8% | 25.6% | 33.8% |
| Divorced | 10.2% | 17.1% | 10.8% |
| Widowed | 10.9% | 7.8% | 5.6% |
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| Household Size | 2.19 | 2.11 | 2.60 |
| Households | 1,153 | 1,008 | 124,010,992 |
| Family Households | 798 | 576 | 80,755,759 |
| Married couple, w/children | 15.3% | 20.8% | 30.5% |
| Married couple, no children | 62.5% | 60.2% | 42.9% |
| Non Family Households | 355 | 432 | 43,255,233 |
| Single householder, w/children | 14.3% | 8.0% | 15.8% |
| Single householder, no children | 7.9% | 10.9% | 10.8% |